_Bertoldo ORSINI ______+
                                                      | (1220 - 1319)         
                          _Gentile II ORSINI _________|
                         | (1245 - 1318)              |
                         |                            |_______________________
                         |                                                    
 _Romano ORSINI _________|
| (1273 - 1326)          |
|                        |                             _______________________
|                        |                            |                       
|                        |____________________________|
|                                                     |
|                                                     |_______________________
|                                                                             
|
|--Roberto ORSINI 
|  (1294 - 1344)
|                                                      _Simon VI of MONTFORT _+
|                                                     | (1208 - 1265)         
|                         _Guy of MONTFORT ___________|
|                        | (1244 - 1291)              |
|                        |                            |_Eleanor PLANTAGENET __+
|                        |                              (1215 - 1275)         
|_Anastasia of MONTFORT _|
  (.... - 1306)          |
                         |                             _______________________
                         |                            |                       
                         |_Margherita ALDOBRANDESCHI _|
                           (1255 - 1313)              |
                                                      |_______________________